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A090368
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a(1) = 1; for n>1, smallest divisor > 1 of 2n-1.
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16
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1, 3, 5, 7, 3, 11, 13, 3, 17, 19, 3, 23, 5, 3, 29, 31, 3, 5, 37, 3, 41, 43, 3, 47, 7, 3, 53, 5, 3, 59, 61, 3, 5, 67, 3, 71, 73, 3, 7, 79, 3, 83, 5, 3, 89, 7, 3, 5, 97, 3, 101, 103, 3, 107, 109, 3, 113, 5, 3, 7, 11, 3, 5, 127, 3, 131, 7, 3, 137, 139, 3, 11, 5, 3, 149, 151, 3, 5, 157, 3, 7
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Remi Eismann, Table of n, a(n) for n = 1..10000
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MATHEMATICA
| Join[{1}, Divisors[#][[2]]&/@Range[3, 161, 2]] (* From Harvey P. Dale, Oct 09 2011 *)
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CROSSREFS
| Bisection of A020639.
Cf. A100773.
Sequence in context: A156030 A130140 A051417 * A120374 A088836 A076565
Adjacent sequences: A090365 A090366 A090367 * A090369 A090370 A090371
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KEYWORD
| nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Nov 27 2003
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EXTENSIONS
| More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 02 2003
Definition corrected by Remi Eismann, May 08 2007
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